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= -2p³ + 3p² - 4p + 2p³ - p² + p
= -2p³ + 2p³ + 3p² - p² - 4p + p
= 2p² - 3p
= -2p^3 + 3p^2 - 4p + 2p^3 - p^2 + p
= -2p^3 + 2p^3 + 3p^2 - p^2 - 4p + p
= 2p^2 - 3p